19315-ZVP-000 Thermostat Cover - Overview. The 19315-ZVP-000 Thermostat Cover is a crucial component of Honda marine engine cooling systems. It houses and seals the thermostat, playing a vital role in regulating engine temperature to prevent overheating and optimize performance. As part of the cooling system, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM thermostat cover designed specifically for Honda marine engin